Siemens SIMATIC S5 135U/155U Central Unit (6ES5188-3UA21)

The Siemens SIMATIC S5 135U/155U Central Unit, part number 6ES5188-3UA21, is a component for older SIMATIC S5 programmable logic controllers. This unit provides 21 slots for I/O modules and features a power supply capable of operating on 230V or 115V AC, with a 5V DC output and 40A capacity. It is important to note that this central unit does not include a CPU or a manual, requiring separate purchase or existing compatible components.

This central unit was a core part of the SIMATIC S5 series, widely used in discrete manufacturing, assembly lines, and process automation from the late 20th century. While an older system, many facilities still rely on SIMATIC S5 for their operations, making these components critical for maintenance and upkeep.

Stanlo Automation, your veteran-owned source for surplus industrial parts, offers the Siemens 6ES5188-3UA21. We understand the importance of supporting legacy systems and can help you acquire the parts needed to keep your established automation running.